An attempt to explain something obscure in terms of something else which is even more obscure.
(logic) A type of fallacious argument in which one attempts to prove something unknown by relying upon an assumption that is also unknown.
Source: en.wiktionary.orgThe art, also, of alchemy or chemistry is surrounded with such insoluble enigmas that we can scarcely gain anything but ignorance therefrom, and ignotum per ignotius. Robert Fludd